At least for the buttons window, you can zoom in or out by hovering the mouse over the buttons and using CTRL-Middle mouse or by pressing + or - on the keypad. That doesn't help the other text though (toolbox, menus, etc.)

Making the fonts smaller for those not using magnifying glass resolution would help too

My button label beef is that the text is automatically centred, and if the text doesn't fit in the button, the start AND end of the label is cut off. Text should be left justified if it gets clipped - but that would slow down the UI.